Computer going Bonkers

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Has any myLotters experience this? Your computer having its own life... Mine does. I have never placed any parental lock on it and it decided to activate it by itself. Now, I cannot access the computer from 9 pm to 10 am. Could it be due to a bug or a virus? I used to have F-Secure Internet Security to scan for viruses. It has already expired. When I'd treid to remove the programme, it just wouldn't budge. Could this security system put a bug on my computer 'cos I wouldn't renew? Any idea?